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    <title>Document</title>
    <script>
        // 检测字符串长度 length
        var str ="my name is pink";
        console.log(str.length);//15
        // 字符串的拼接
        console.log('骆驼'+'沙漠');
        console.log('pink老师'+'18e');
        console.log(12+12);//24
        console.log('12'+'12');//1212
    </script>
</head>
<body>
    
</body>
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